Network Working Group V. Vassilev Internet-Draft Lightside Instruments AS Intended status: Standards Track January 5, 2020 Expires: July 8, 2020 A YANG Data Model for Network Bridge Management draft-vassilev-netmod-network-bridge-03 Abstract This document introduces new YANG model of a network bridge. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on July 8, 2020. Copyright Notice Copyright (c) 2020 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Vassilev Expires July 8, 2020 [Page 1] Internet-Draft NETWORK-BRIDGE-03 January 2020 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 2 1.1.1. YANG . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1.2. Tree Diagrams . . . . . . . . . . . . . . . . . . . . 3 1.2. Problem Statement . . . . . . . . . . . . . . . . . . . . 3 1.3. Solution . . . . . . . . . . . . . . . . . . . . . . . . 3 1.3.1. Forwarding . . . . . . . . . . . . . . . . . . . . . 4 1.3.2. Scheduling . . . . . . . . . . . . . . . . . . . . . 4 2. Network Bridge Module Tree Diagram . . . . . . . . . . . . . 7 3. Network Bridge Flows Module Tree Diagram . . . . . . . . . . 7 4. Network Bridge Scheduler Module Tree Diagram . . . . . . . . 10 5. Network Bridge Module YANG . . . . . . . . . . . . . . . . . 12 6. Network Bridge Flows Module YANG . . . . . . . . . . . . . . 14 7. Network Bridge Scheduler Module YANG . . . . . . . . . . . . 24 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 35 8.1. NETWORK BRIDGE YANG Modules . . . . . . . . . . . . . . . 35 9. Security Considerations . . . . . . . . . . . . . . . . . . . 36 10. Normative References . . . . . . . . . . . . . . . . . . . . 36 Appendix A. Example . . . . . . . . . . . . . . . . . . . . . . 36 A.1. Model . . . . . . . . . . . . . . . . . . . . . . . . . . 37 A.2. Scheduler diagram . . . . . . . . . . . . . . . . . . . . 39 A.3. Topology . . . . . . . . . . . . . . . . . . . . . . . . 40 A.4. CLI listing . . . . . . . . . . . . . . . . . . . . . . . 40 A.5. Configuration Data Instance . . . . . . . . . . . . . . . 42 A.6. Companion YANG Data Model for Implementations Not Compliant with NMDA . . . . . . . . . . . . . . . . . . . 52 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 55 1. Introduction There is a need for a YANG model for management of network bridges. The model should allow the variety of existing forwarding and scheduling technologies to be defined as interoperable modules that can be interconnected and extended. 1.1. Terminology The keywords "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14, [RFC2119]. Vassilev Expires July 8, 2020 [Page 2] Internet-Draft NETWORK-BRIDGE-03 January 2020 1.1.1. YANG The following terms are defined in [RFC7950]: o must statement o augment statement o context node o container o data node o key leaf o leaf o leaf-list o list 1.1.2. Tree Diagrams Tree diagrams used in this document follow the notation defined in [RFC8340]. 1.2. Problem Statement This document attempts to address the problem of defining YANG model of a network bridge that can be used as common framework by different forwarding and scheduling implementations. 1.3. Solution A Network bridge has more then 1 ingress and 1 or more egress ports. It has 1 or more traffic classes. The proposed model splits the design into 2 components - 1) Forwarding component and 2) Scheduling component. The forwarding component is connected to all ingress ports and forwards traffic from them to the scheduler instances connected to the egress ports. The scheduling component is a set of scheduler instances - topologies of interconnected aggregators and filters connected to a single egress port and as many as ingress_ports_count*traffic_class_count datapaths from the forwarding component. Vassilev Expires July 8, 2020 [Page 3] Internet-Draft NETWORK-BRIDGE-03 January 2020 1.3.1. Forwarding The simple idea of creating a YANG model for a subset of the original [OpenFlow] specification is used as base for the model for management of the Forwarding Information Base (FIB) of the bridge. 1.3.2. Scheduling The scheduler(s) have 1 or more input datapaths and 1 output. To each datapath the forwarding component can forward flows. Many different scheduler implementations have structure based on common modular abstractions flow meters, delay lines, queues, gates and gate control logic that determines the gate states based on variables defined in the flow meter, the delay line or the queue or signals and timers available to the gate control logic algorithm. The concept is illustrated with the following model of a 2 ingress ports, 2 traffic classes implementation of a 2 class strict priority scheduling bridge: Vassilev Expires July 8, 2020 [Page 4] Internet-Draft NETWORK-BRIDGE-03 January 2020 ingress0 ingress1 V V | | +------------------------------+ | FIB | | class0 class1 | | 0->0 1->0 0->0 1->0 | +------------------------------+ | | | | {M} {M} {M} {M} | | | | \ / \ / \ / \ / +-------+ +-------+ | Queue | | Queue | |=======| |=======| |=======| |=======| |=======| |=======| |=======| |=======| +-------+ +-------+ | | G0 G1 +-----------------------------+ | C | | strict-priority | +-----------------------------+ | V egress* The common structure of a scheduler module (S) consisting of topology of consecutive flow-meters (M), gates (G) connected to a common gate control - (C) with a single egress port. A new module type representing delay line (D) is added to the structure of the scheduler before Q. The delay line (D) is important for time- sensitive scheduler models where propagation delays, store-and- forward delays and even programmable delays in some cases need to be represented. For certain time sensitive applications it is important to differentiate between different ports due to rate conversion, store and forward and other factors influencing the behavior of the bridge. This is why the concept of a port class is introduced in the model. Vassilev Expires July 8, 2020 [Page 5] Internet-Draft NETWORK-BRIDGE-03 January 2020 v v | | {M0} {Mn} | | +---+ +---+ | D | | D | | e | | e | | l | | l | | a | | a | | y | | y | +---+ +---+ | | +-----+ +-----+ | Q0 | | Qn | |=====| |=====| |=====| ... |=====| |=====| |=====| |=====| |=====| +-----+ +-----+ | | G0 Gn +--------------------+ | C | +--------------------+ | v Depending on the scheduler design the ingress flows can specify different D and Q parameters e.g. D.time=0 means no delay, Q.len=0 means no buffering and immediate drop of packets in case the gate is closed. With the submodules collapsed to an integral generic gate controller module (GC) the diagram becomes much simpler. Vassilev Expires July 8, 2020 [Page 6] Internet-Draft NETWORK-BRIDGE-03 January 2020 ingress0 ingress1 V V | | +------------------------------+ | FIB | | class0 class1 | | 0->0 1->0 0->0 1->0 | +------------------------------+ | | | | +-----------------------------+ | GC | +-----------------------------+ | V egress0 Complex scheduler designs exist that can combine several different gate controllers into complex topology. This concept is demonstrated in the example bridge. 2. Network Bridge Module Tree Diagram module: ietf-network-bridge +--rw bridge +--rw ports +--rw port* [name] +--rw name string +--rw index? uint64 augment /if:interfaces/if:interface: +--rw port-name? -> /bridge/ports/port/name 3. Network Bridge Flows Module Tree Diagram module: ietf-network-bridge-flows +--rw packet-in-message | +--rw packet-in-reason? identityref | +--rw ingress? netbr:port-ref | +--rw payload? binary | +--rw match | +--rw in-port? netbr:port-ref | +--rw ethernet-match | | +--rw ethernet-source! | | | +--rw address yang:mac-address | | | +--rw mask? yang:mac-address | | +--rw ethernet-destination! | | | +--rw address yang:mac-address Vassilev Expires July 8, 2020 [Page 7] Internet-Draft NETWORK-BRIDGE-03 January 2020 | | | +--rw mask? yang:mac-address | | +--rw ethernet-type! | | +--rw type ether-type | +--rw vlan-match | +--rw vlan-id! | | +--rw vlan-id-present? boolean | | +--rw vlan-id? vlan-id | +--rw vlan-pcp? vlan-pcp +--rw flows +--rw flow* [id] +--rw id flow-id +--rw match | +--rw in-port? netbr:port-ref | +--rw ethernet-match | | +--rw ethernet-source! | | | +--rw address yang:mac-address | | | +--rw mask? yang:mac-address | | +--rw ethernet-destination! | | | +--rw address yang:mac-address | | | +--rw mask? yang:mac-address | | +--rw ethernet-type! | | +--rw type ether-type | +--rw vlan-match | +--rw vlan-id! | | +--rw vlan-id-present? boolean | | +--rw vlan-id? vlan-id | +--rw vlan-pcp? vlan-pcp +--rw actions | +--rw action* [order] | +--rw order int32 | +--rw (action)? | +--:(output-action-case) | | +--rw output-action | | +--rw out-port? netbr:port-ref | | +--rw max-length? uint16 | +--:(controller-action-case) | | +--rw controller-action | | +--rw max-length? uint16 | +--:(drop-action-case) | | +--rw drop-action! | +--:(pop-vlan-action-case) | | +--rw pop-vlan-action! | +--:(push-vlan-action-case) | | +--rw push-vlan-action | | +--rw ethernet-type? ether-type | | +--rw pcp? vlan-pcp | | +--rw cfi? vlan-cfi | | +--rw vlan-id? vlan-id Vassilev Expires July 8, 2020 [Page 8] Internet-Draft NETWORK-BRIDGE-03 January 2020 | +--:(set-vlan-cfi-action-case) | | +--rw set-vlan-cfi-action | | +--rw vlan-cfi? vlan-cfi | +--:(set-vlan-id-action-case) | | +--rw set-vlan-id-action | | +--rw vlan-id? vlan-id | +--:(set-vlan-pcp-action-case) | | +--rw set-vlan-pcp-action | | +--rw vlan-pcp? vlan-pcp | +--:(strip-vlan-action-case) | +--rw strip-vlan-action! +--ro flow-statistics +--ro packet-count? yang:counter64 +--ro byte-count? yang:counter64 rpcs: +---x transmit-packet +---w input +---w egress? netbr:port-ref +---w ingress? netbr:port-ref +---w payload? binary +---w action* [order] +---w order int32 +---w (action)? +--:(output-action-case) | +---w output-action | +---w out-port? netbr:port-ref | +---w max-length? uint16 +--:(controller-action-case) | +---w controller-action | +---w max-length? uint16 +--:(drop-action-case) | +---w drop-action! +--:(pop-vlan-action-case) | +---w pop-vlan-action! +--:(push-vlan-action-case) | +---w push-vlan-action | +---w ethernet-type? ether-type | +---w pcp? vlan-pcp | +---w cfi? vlan-cfi | +---w vlan-id? vlan-id +--:(set-vlan-cfi-action-case) | +---w set-vlan-cfi-action | +---w vlan-cfi? vlan-cfi +--:(set-vlan-id-action-case) | +---w set-vlan-id-action | +---w vlan-id? vlan-id +--:(set-vlan-pcp-action-case) Vassilev Expires July 8, 2020 [Page 9] Internet-Draft NETWORK-BRIDGE-03 January 2020 | +---w set-vlan-pcp-action | +---w vlan-pcp? vlan-pcp +--:(strip-vlan-action-case) +---w strip-vlan-action! notifications: +---n packet-received +--ro packet-in-reason? identityref +--ro ingress? netbr:port-ref +--ro payload? binary +--ro match +--ro in-port? netbr:port-ref +--ro ethernet-match | +--ro ethernet-source! | | +--ro address yang:mac-address | | +--ro mask? yang:mac-address | +--ro ethernet-destination! | | +--ro address yang:mac-address | | +--ro mask? yang:mac-address | +--ro ethernet-type! | +--ro type ether-type +--ro vlan-match +--ro vlan-id! | +--ro vlan-id-present? boolean | +--ro vlan-id? vlan-id +--ro vlan-pcp? vlan-pcp 4. Network Bridge Scheduler Module Tree Diagram module: ietf-network-bridge-scheduler augment /flow:flows/flow:flow: +--rw traffic-class? | -> /netbr:bridge/sched:traffic-classes/traffic-class augment /netbr:bridge/netbr:ports/netbr:port: +--rw class? port-class-ref +--rw class-instance-index? uint32 augment /netbr:bridge: +--rw default-traffic-class? traffic-class-ref +--rw default-port-class? traffic-class-ref +--rw traffic-classes | +--rw traffic-class* identityref +--rw port-classes +--rw port-class* identityref augment /if:interfaces/if:interface: +--rw scheduler +--rw gate-controllers +--rw gate-controller* [id] +--rw id string Vassilev Expires July 8, 2020 [Page 10] Internet-Draft NETWORK-BRIDGE-03 January 2020 +--rw type identityref +--rw inputs | +--rw input* [class index] | +--rw class identityref | +--rw index uint32 | +--ro queued-pkts? uint64 | +--ro queued-bytes? uint64 | +--ro discards? uint64 | +--ro overflow-discards? uint64 | +--ro error-discards? uint64 +--rw input-classes +--rw input-class* [class] +--rw class identityref +--ro queued-pkts? uint64 +--ro queued-bytes? uint64 +--ro discards? uint64 +--ro overflow-discards? uint64 +--ro error-discards? uint64 augment /netbr:bridge: +--rw scheduler-classes +--rw scheduler-class* [egress-port-class] +--rw egress-port-class sched:port-class-ref +--rw inputs | +--rw input* [traffic-class ingress-port-class] | +--rw traffic-class traffic-class-ref | +--rw ingress-port-class port-class-ref | +--rw gate-controller? leafref | +--rw input-class? leafref | +--rw base-index? uint32 +--rw gate-controllers +--rw gate-controller* [id] +--rw id string +--rw type identityref +--rw inputs | +--rw input* [class] | +--rw class identityref | +--rw instance-count? uint32 | +--rw constant-propagation-delay? uint64 | +--rw configurable-delay-line? uint64 | +--rw queue-len? uint32 +--rw output +--rw gate-controller? leafref +--rw input-class? leafref +--rw index? uint32 Vassilev Expires July 8, 2020 [Page 11] Internet-Draft NETWORK-BRIDGE-03 January 2020 5. Network Bridge Module YANG file "ietf-network-bridge@2020-01-05.yang" module ietf-network-bridge { namespace "urn:ietf:params:xml:ns:yang:ietf-network-bridge"; prefix netbr; import ietf-interfaces { prefix if; } organization "IETF NETMOD (NETCONF Data Modeling Language) Working Group"; contact "WG Web: WG List: Editor: Vladimir Vassilev "; description "This module contains a collection of YANG definitions for description and management of network bridges. Copyright (c) 2020 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; revision 2020-01-05 { description "Initial revision."; reference "RFC XXXX: Network Bridge"; } typedef port-ref { type leafref { path "/if:interfaces/if:interface/netbr:port-name"; } Vassilev Expires July 8, 2020 [Page 12] Internet-Draft NETWORK-BRIDGE-03 January 2020 description "This type is used by data models that need to reference configured bridge ports."; } augment "/if:interfaces/if:interface" { description "Bridge port specific data."; leaf port-name { type leafref { path "/netbr:bridge/netbr:ports/netbr:port/netbr:name"; } description "Reference to the bridge port"; } } container bridge { description "Bridge parameters."; container ports { description "Member ports."; list port { key "name"; unique "index"; description "The list of bridge ports on the device."; leaf name { type string; description "Name of the port."; } leaf index { type uint64; description "Index of the port."; } } } } } Vassilev Expires July 8, 2020 [Page 13] Internet-Draft NETWORK-BRIDGE-03 January 2020 6. Network Bridge Flows Module YANG file "ietf-network-bridge-flows@2020-01-05.yang" module ietf-network-bridge-flows { namespace "urn:ietf:params:xml:ns:yang:ietf-network-bridge-flows"; prefix flow; import ietf-network-bridge { prefix netbr; } import ietf-inet-types { prefix inet; revision-date 2013-07-15; } import ietf-yang-types { prefix yang; revision-date 2013-07-15; } organization "IETF NETMOD (NETCONF Data Modeling Language) Working Group"; contact "WG Web: WG List: Editor: Vladimir Vassilev "; description "This module contains a collection of YANG definitions for description and management of network bridge based on flows. Copyright (c) 2020 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; revision 2020-01-05 { description Vassilev Expires July 8, 2020 [Page 14] Internet-Draft NETWORK-BRIDGE-03 January 2020 "Unreleased revision."; reference "RFC XXXX: Network Bridge"; } identity packet-in-reason { description "Base identity for all the available packet in reasons."; } identity no-match { base packet-in-reason; description "No matching flow in the classifier"; } identity send-to-controller { base packet-in-reason; description "Explicit instruction to send packet to controller"; } identity invalid-ttl { base packet-in-reason; description "Packet with invalid TTL"; } typedef vlan-pcp { type uint8 { range "0..7"; } description "IEEE 802.1p priority. It indicates the frame priority level. Values are from 0 (best effort) to 7 (highest); 1 represents the lowest priority."; } typedef vlan-id { type uint16 { range "0..4095"; } description "IETF 802.1q VLAN tag id."; } typedef ether-type { type uint16; Vassilev Expires July 8, 2020 [Page 15] Internet-Draft NETWORK-BRIDGE-03 January 2020 description "Length/Type field of the generated Ethernet packet."; reference "IEEE 802-2014 Clause 9.2"; } typedef vlan-cfi { type int32; description "Canonical Format Identifier (CFI) field (shall be 0 for Ethernet switches) of the transmitted 802.1q VLAN tag."; } typedef flow-id { type inet:uri; description "Flow identifier."; } grouping address { description "IP address."; choice address { description "Address choice."; case ipv4 { leaf ipv4-address { type inet:ipv4-prefix; description "IPv4 address."; } } case ipv6 { leaf ipv6-address { type inet:ipv6-prefix; description "IPv6 address."; } } } } grouping action-list { description "Action list grouping."; list action { key "order"; Vassilev Expires July 8, 2020 [Page 16] Internet-Draft NETWORK-BRIDGE-03 January 2020 description "Contains action with corresponding order index."; leaf order { type int32; description "Order index."; } uses action; } } grouping action { description "Grouping of all action data definitions."; choice action { description "Choice with alternative action cases."; case output-action-case { container output-action { description "Contains output action specific data."; leaf out-port { type netbr:port-ref; description "Port on which the packet is sent."; } leaf max-length { type uint16; description "Packets above this length are discarded."; } } } case controller-action-case { container controller-action { description "Contains controller action specific data."; leaf max-length { type uint16; description "Packets above this length are discarted."; } } } case drop-action-case { container drop-action { presence "Drop action case"; description Vassilev Expires July 8, 2020 [Page 17] Internet-Draft NETWORK-BRIDGE-03 January 2020 "Drop action presence container."; } } case pop-vlan-action-case { container pop-vlan-action { presence "Pop-vlan action case."; description "Pop-vlan presence container"; } } case push-vlan-action-case { container push-vlan-action { description "Contains push-vlan action specific data."; leaf ethernet-type { type ether-type; description "Tag protocol identifier (TPID) as defined in IEEE 802.1q"; } leaf pcp { type vlan-pcp; description "Specifies the IEEE 802.1p Priority Code Point (PCP) value of the pushed 802.1q VLAN tag."; } leaf cfi { type vlan-cfi; description "Configures the Canonical Format Identifier (CFI) field (shall be 0 for Ethernet switches) of the transmitted 802.1q VLAN tag."; } leaf vlan-id { type vlan-id; description "Specifies the VLAN ID as defined in IEEE 802.1q of the pushed VLAN tag."; } } } case set-vlan-cfi-action-case { container set-vlan-cfi-action { description "Contains set-vlan-cfi action specific data. The set-vlan-cfi action is used to replace CFI field on already tagged packets."; leaf vlan-cfi { Vassilev Expires July 8, 2020 [Page 18] Internet-Draft NETWORK-BRIDGE-03 January 2020 type vlan-cfi; description "Configures the Canonical Format Identifier (CFI) field to set on the transmitted 802.1q VLAN tagged packet."; } } } case set-vlan-id-action-case { container set-vlan-id-action { description "Contains set-vlan-id action specific data. The set-vlan-id action is used to replace VLAN ID field on already tagged packets."; leaf vlan-id { type vlan-id; description "Specifies the VLAN ID to set on the 802.1q VLAN tagged packet."; } } } case set-vlan-pcp-action-case { container set-vlan-pcp-action { description "Contains set-vlan-pcp action specific data. The set-vlan-pcp action is used to replace VLAN PCP field on already tagged packets."; leaf vlan-pcp { type vlan-pcp; description "Specifies the IEEE 802.1p Priority Code Point (PCP) value to set on the 802.1q VLAN tagged packet."; } } } case strip-vlan-action-case { container strip-vlan-action { presence "Strip-vlan action case"; description "Strip-vlan presence container."; } } } } grouping mac-address-filter { description Vassilev Expires July 8, 2020 [Page 19] Internet-Draft NETWORK-BRIDGE-03 January 2020 "Defines address and mask pair for definition of basic MAC address filter rules."; leaf address { type yang:mac-address; mandatory true; description "MAC address to compare with."; } leaf mask { type yang:mac-address; description "The mask specifies the bits to compare. All bits that are 1s are significant."; } } grouping ethernet-match-fields { description "Defines data for specification of filter rules for Ethernet frames based on source and destination MAC addresses and the ethernet type field."; container ethernet-source { presence "Match field is active and set"; description "Ethernet source address."; uses mac-address-filter; } container ethernet-destination { presence "Match field is active and set"; description "Ethernet destination address."; uses mac-address-filter; } container ethernet-type { presence "Match field is active and set"; description "Ethernet frame type."; leaf type { type ether-type; mandatory true; description "Type field of the Ethernet frame."; } } } grouping vlan-match-fields { description Vassilev Expires July 8, 2020 [Page 20] Internet-Draft NETWORK-BRIDGE-03 January 2020 "Defines data for specification of filter rules for VLAN tagged or not Ethernet frames based on the presence of VLAN tag, the value of the VLAN ID and VLAN PCP fields."; container vlan-id { presence "Match field is active and set"; description "Match 802.1q VLAN ID."; leaf vlan-id-present { type boolean; description "If set to false match packets with different VLAN ID then the specified in the vlan-id leaf."; } leaf vlan-id { type vlan-id; description "802.1q VLAN ID to match. The match rule can be inverted by setting vlan-id-present to false."; } } leaf vlan-pcp { type vlan-pcp; description "Match 802.1p VLAN Priority code point (PCP) field."; } } grouping match { description "Defines data for specification of filter rules."; leaf in-port { type netbr:port-ref; description "Input port to match."; } container ethernet-match { description "Ethernet match rules."; uses ethernet-match-fields; } container vlan-match { description "VLAN match rules."; uses vlan-match-fields; } } Vassilev Expires July 8, 2020 [Page 21] Internet-Draft NETWORK-BRIDGE-03 January 2020 grouping raw-packet { description "Basic packet structure."; leaf ingress { type netbr:port-ref; description "Port the packet was received on."; } leaf payload { type binary; description "Payload of the packet."; } } grouping packet-in { description "Input packet event data: ingress port, payload, event reason."; leaf packet-in-reason { type identityref { base packet-in-reason; } description "Reason identity: no-match, send-to-controller, invalid-ttl or another reason for the corresponding packet-in event."; } uses raw-packet; } grouping ethernet-packet { description "Ethernet packet headers structure."; leaf source { type yang:mac-address; description "MAC source address."; } leaf destination { type yang:mac-address; description "MAC destination address."; } } grouping flow { description Vassilev Expires July 8, 2020 [Page 22] Internet-Draft NETWORK-BRIDGE-03 January 2020 "The definition of a flow has a name, match container specifying filter rules and ordered list of actions to be performed on each packet."; leaf id { type flow-id; description "Flow identifier."; } container match { description "Filter rules for the flow."; uses match; } container actions { description "Ordered list of actions."; uses action-list; } } rpc transmit-packet { description "Sending packet out."; input { leaf egress { type netbr:port-ref; description "Egress port the packet will be transmitted from."; } uses raw-packet; uses action-list; } } notification packet-received { description "Delivery of incoming packet."; uses packet-in; container match { description "Match data that triggered the source of the packet-received event."; uses match; } } container packet-in-message { Vassilev Expires July 8, 2020 [Page 23] Internet-Draft NETWORK-BRIDGE-03 January 2020 description "Container with the last packet-in reported. Useful for basic monitoring."; uses packet-in; container match { description "Match data that triggered the source of the last packet-received event."; uses match; } } container flows { description "Contains the list of all configured flows."; list flow { key "id"; description ""; uses flow; container flow-statistics { config false; description "Contains flow counters."; leaf packet-count { type yang:counter64; description "Packets matched."; } leaf byte-count { type yang:counter64; description "Sum of the bytes of all matched packets."; } } } } } 7. Network Bridge Scheduler Module YANG file "ietf-network-bridge-scheduler@2020-01-05.yang" module ietf-network-bridge-scheduler { namespace "urn:ietf:params:xml:ns:yang:ietf-network-bridge-scheduler"; prefix sched; Vassilev Expires July 8, 2020 [Page 24] Internet-Draft NETWORK-BRIDGE-03 January 2020 import ietf-network-bridge { prefix netbr; } import ietf-network-bridge-flows { prefix flow; } import ietf-interfaces { prefix if; } organization "IETF NETMOD (NETCONF Data Modeling Language) Working Group"; contact "WG Web: WG List: Editor: Vladimir Vassilev "; description "This module contains a collection of YANG definitions for description and management of network bridge schedulers. Copyright (c) 2020 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; revision 2020-01-05 { description "Initial revision."; reference "RFC XXXX: Network Bridge"; } identity gate-controller { description "Represents the gate control block type e.g. round-robin, priority-based, time-aware-802dot1qbv etc."; } Vassilev Expires July 8, 2020 [Page 25] Internet-Draft NETWORK-BRIDGE-03 January 2020 identity aggregator { base gate-controller; description "Abstract identity that all gate control blocks with multiple inputs and single output use as basetype e.g. round-robin, priority-based, time-aware-802dot1qbv etc."; } identity filter { base gate-controller; description "Abstract identity that all gate control blocks with corresponding input and output instances use as basetype e.g. rate-limiters, simple propagation delays, shapers etc."; } identity gate-controller-input { description "Identifies gate controller input type."; } identity private-queue-aggregator-input { base gate-controller-input; description "Abstract input identifier for gate controller inputs of the aggregator type where all instances of the input types derived from this identifier have their own private queue."; } identity shared-queue-aggregator-input { base gate-controller-input; description "Abstract input identifier for gate controller inputs of the aggregator type where all instances of the input types derived from this identifier have shared queue."; } identity filter-input { base gate-controller-input; description "Abstract input identifier for gate controller inputs of the filter type."; } identity traffic-class { description Vassilev Expires July 8, 2020 [Page 26] Internet-Draft NETWORK-BRIDGE-03 January 2020 "Identifies traffic class."; } identity port-class { description "Identifies port class. Ports that belong to a class will have the same scheduler-class on their egress and have identical flow path through the rest of the scheduler classes."; } typedef port-class-ref { type leafref { path "/netbr:bridge/sched:port-classes/sched:port-class"; } description "This type is used by data models that need to reference configured port-class."; } typedef traffic-class-ref { type leafref { path "/netbr:bridge/sched:traffic-classes/sched:traffic-class"; } description "This type is used by data models that need to reference configured traffic-class."; } grouping gate-controller-input-config { description "Common gate controller input configuration data definitions."; leaf constant-propagation-delay { type uint64; units "picoseconds"; description "Constant delay attributed to delays in the gate-controller."; } leaf configurable-delay-line { type uint64; units "picoseconds"; description "Some gate controllers can delay the flow of packets with configurable delay which is added to the constant propagation-delay. Only inputs with zero queue lengths have deterministic delays equal to the sum of the constant-propagation-delay and the configurable-delay-line leafs. Inputs with queues have variable higher delay with Vassilev Expires July 8, 2020 [Page 27] Internet-Draft NETWORK-BRIDGE-03 January 2020 dynamic component based on the controllers logic."; } leaf queue-len { type uint32; units "bytes"; description "Length of the queue."; } } grouping gate-controller-queue-state { description "Common gate controller queue state data definitions."; leaf queued-pkts { type uint64; config false; description "Number of packets queued."; } leaf queued-bytes { type uint64; config false; description "Number of bytes of the packets queued."; } leaf discards { type uint64; config false; description "The total number of discarded packets that were received on this input. This includes but is not limited to the overflow-discards. For example gate-controllers can start discarding certain packets before the input queue is filled. These discards are not registered as overflow-discards. The lower 32 bits of the sum of all discards counters part of a scheduler are equal to the /if:interfaces/if:interface/if:statistics/if:out-discards counter for the corresponding interface."; } leaf overflow-discards { type uint64; config false; description "Unintended discard caused by overflow of the input queue of the gate controller."; } Vassilev Expires July 8, 2020 [Page 28] Internet-Draft NETWORK-BRIDGE-03 January 2020 leaf error-discards { type uint64; config false; description "Unintended discards caused by error in the scheduler."; } } augment "/flow:flows/flow:flow" { description "Adds traffic-class to the flow model."; leaf traffic-class { type leafref { path "/netbr:bridge/sched:traffic-classes/sched:traffic-class"; } description "Specifies the traffic class of a flow. When not present the default traffic class is used."; } } augment "/netbr:bridge/netbr:ports/netbr:port" { description "Adds port class and class-instance-index leafs."; leaf class { type port-class-ref; description "A port class allows discrimination of ports based on features and supported scheduler options."; } leaf class-instance-index { type uint32; description "Index enumerating the instances of the same port class."; } } augment "/netbr:bridge" { description "Adds scheduler specific data to the bridge model."; leaf default-traffic-class { type traffic-class-ref; description "Specifies the traffic-class for flows without /flow:flows/flow:flow/sched:traffic-class leaf."; } leaf default-port-class { Vassilev Expires July 8, 2020 [Page 29] Internet-Draft NETWORK-BRIDGE-03 January 2020 type traffic-class-ref; description "Specifies the traffic-class for flows without /flow:flows/flow:flow/sched:traffic-class leaf."; } container traffic-classes { description "Contains the leaf-list of available traffic classes."; leaf-list traffic-class { type identityref { base traffic-class; } description "Leaf-list of available traffic classes."; } } container port-classes { description "Contains the leaf-list of available port classes."; leaf-list port-class { type identityref { base port-class; } description "Leaf-list of available port classes."; } } } augment "/if:interfaces/if:interface" { description "Augments the interface model with scheduler specific data."; container scheduler { description "Each egress capable interface has scheduler. The scheduler is a tree of interconnected gate controllers."; container gate-controllers { description "Contains the list of gate controllers."; list gate-controller { key "id"; description "The gate controller model can be augmented by external modules defining custom gate controller types."; leaf id { type string; description Vassilev Expires July 8, 2020 [Page 30] Internet-Draft NETWORK-BRIDGE-03 January 2020 "Gate controller identifier."; } leaf type { type identityref { base gate-controller; } mandatory true; description "Gate controller type."; } container inputs { description "Contains the list of inputs."; list input { key "class index"; description "Double key list. There can be multiple instances of each input class."; leaf class { type identityref { base gate-controller-input; } description "Input class."; } leaf index { type uint32; description "Index of the input instance of the corresponding input class."; } uses gate-controller-queue-state; } } container input-classes { description "Contains the list of input-classes."; list input-class { key "class"; description "Contains configuration and state data that is common for all instances of certain input class."; leaf class { type identityref { base gate-controller-input; } description "Input class."; Vassilev Expires July 8, 2020 [Page 31] Internet-Draft NETWORK-BRIDGE-03 January 2020 } uses gate-controller-queue-state; } } } } } } augment "/netbr:bridge" { description "Augments the bridge module with scheduler specific configuration data."; container scheduler-classes { description "Contains list of scheduler-classes."; list scheduler-class { key "egress-port-class"; description "All ports of same class inherit the scheduler configuration. The instance specific scheduler configuration defined under /interfaces/interface/scheduler can override this configuration."; leaf egress-port-class { type sched:port-class-ref; description "The port class the scheduler coonfiguration applies for."; } container inputs { description "Contains list of inputs."; list input { key "traffic-class ingress-port-class"; description "Double key list. There can be multiple instances of each input class."; leaf traffic-class { type traffic-class-ref; description "Reference to traffic class."; } leaf ingress-port-class { type port-class-ref; description "Reference to port class."; } leaf gate-controller { Vassilev Expires July 8, 2020 [Page 32] Internet-Draft NETWORK-BRIDGE-03 January 2020 type leafref { path "../../../gate-controllers/gate-controller/id"; } description "Reference to gate controller id."; } leaf input-class { type leafref { path "../../../gate-controllers/gate-controller" + "[id=current()/../gate-controller]" + "/inputs/input/class"; } description "Reference to a input class defined for the specified gate controller."; } leaf base-index { type uint32; default "0"; description "Base index for the inputs of this class."; } } } container gate-controllers { description "Contains the list of gate controllers."; list gate-controller { key "id"; description "The gate controller model can be augmented by external modules defining custom gate controller types."; leaf id { type string; description "Gate controller identifier."; } leaf type { type identityref { base gate-controller; } mandatory true; description "Gate controller type."; } container inputs { description Vassilev Expires July 8, 2020 [Page 33] Internet-Draft NETWORK-BRIDGE-03 January 2020 "Contains the list of inputs."; list input { key "class"; description "Double key list. There can be multiple instances of each input class."; leaf class { type identityref { base gate-controller-input; } mandatory true; description "Input class."; } leaf instance-count { type uint32; description "Number of input instances of the specified class."; } uses gate-controller-input-config; } } container output { description "Configuration of the gate-controller input the output is connected to."; leaf gate-controller { type leafref { path "../../../gate-controller/id"; } description "Specifies the gate-controller this output is connected to."; } leaf input-class { type leafref { path "../../../gate-controller" + "[id=current()/../gate-controller]/" + "inputs/input/class"; } description "Specifies the input-class of the gate-controller the input this output is connected to."; } leaf index { type uint32; description Vassilev Expires July 8, 2020 [Page 34] Internet-Draft NETWORK-BRIDGE-03 January 2020 "In case the gate-controller is aggregator this is the index of the only input it is connected to from the specified class. If the gate-controller is filter with more then one input-output pairs this is the base index and the remaining indexes are connected to consecutive input indexes of the specified input class."; } } } } } } } } 8. IANA Considerations 8.1. NETWORK BRIDGE YANG Modules This document registers 3 YANG modules in the YANG Module Names registry [RFC7950]. name: ietf-network-bridge namespace: urn:ietf:params:xml:ns:yang:ietf-network-bridge prefix: netbr // RFC Ed. remove this line and replace XXXX in next line reference: RFC XXXX name: ietf-network-bridge-flows namespace: urn:ietf:params:xml:ns:yang:ietf-network-bridge-flows prefix: flow // RFC Ed. remove this line and replace XXXX in next line reference: RFC XXXX name: ietf-network-bridge-scheduler namespace: urn:ietf:params:xml:ns:yang:ietf-network-bridge-scheduler prefix: sched // RFC Ed. remove this line and replace XXXX in next line reference: RFC XXXX Vassilev Expires July 8, 2020 [Page 35] Internet-Draft NETWORK-BRIDGE-03 January 2020 9. Security Considerations This document does not introduce any new security concerns in addition to those specified in [RFC7950], section 15. 10. Normative References [OpenFlow] "Open Networking Foundation", ""OpenFlow Switch Specification"", December 2009, . [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, January 2004. [RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed., and A. Bierman, Ed., "Network Configuration Protocol (NETCONF)", RFC 6241, June 2011. [RFC6991] Schoenwaelder, J., "Common YANG Data Types", RFC 6991, July 2013. [RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language", RFC 7950, DOI 10.17487/RFC7950, August 2016, . [RFC8340] Bjorklund, M., Ed. and L. Berger, Ed., "YANG Tree Diagrams", RFC 8340, DOI 10.17487/RFC8340, March 2018, . [RFC8342] Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K., and R. Wilton, "Network Management Datastore Architecture (NMDA)", RFC 8342, DOI 10.17487/RFC8342, March 2018, . Appendix A. Example Example bridge with signaling, video0, video1 and best-effort traffic classes. Vassilev Expires July 8, 2020 [Page 36] Internet-Draft NETWORK-BRIDGE-03 January 2020 A.1. Model module example-bridge { yang-version 1.1; namespace "http://example.com/ns/example-bridge"; prefix example; import ietf-network-bridge { prefix netbr; } import ietf-network-bridge-scheduler { prefix sched; } organization "example.com"; description "Example of bridge."; revision 2018-07-15 { description "Initial."; } identity video0 { base sched:traffic-class; } identity video1 { base sched:traffic-class; } identity signaling { base sched:traffic-class; } identity best-effort { base sched:traffic-class; } identity default-port { base sched:port-class; } //Strict priority aggregator with 3 classes: identity strict-priority-aggregator { base sched:aggregator; } Vassilev Expires July 8, 2020 [Page 37] Internet-Draft NETWORK-BRIDGE-03 January 2020 identity pri0 { base sched:shared-queue-aggregator-input; base strict-priority-aggregator; } identity pri1 { base sched:shared-queue-aggregator-input; base strict-priority-aggregator; } identity pri2 { base sched:shared-queue-aggregator-input; base strict-priority-aggregator; } //Cyclic timeslot schedule aggregator with 2 timeslots: identity cyclic-timeslot-schedule-aggregator { base sched:aggregator; } identity timeslot0 { base sched:shared-queue-aggregator-input; base cyclic-timeslot-schedule-aggregator; } identity timeslot1 { base sched:shared-queue-aggregator-input; base cyclic-timeslot-schedule-aggregator; } augment "/netbr:bridge/sched:scheduler-classes/sched:scheduler-class" + "/sched:gate-controllers/sched:gate-controller" { when "./sched:type = 'example:cyclic-timeslot-schedule-aggregator'"; leaf period { type uint32; units "nanoseconds"; } leaf time-slot0-interval { type uint32; units "nanoseconds"; } leaf time-slot1-interval { type uint32; units "nanoseconds"; } } Vassilev Expires July 8, 2020 [Page 38] Internet-Draft NETWORK-BRIDGE-03 January 2020 //Rate limiter - filter: identity rate-limiter { base sched:filter; } identity in { base sched:filter-input; base rate-limiter; } augment "/netbr:bridge/sched:scheduler-classes/sched:scheduler-class" + "/sched:gate-controllers/sched:gate-controller" { when "./sched:type = 'example:rate-limiter'"; leaf interval { type uint32; units "nanoseconds"; } leaf limit { type uint32; units "octets"; } } } A.2. Scheduler diagram The scheduler toplogy and the gate controller instances are specified in the operational configuration data that can be modified or not depending on the underlying implementation. The single letter identifiers for the gate-controllers have the following identities: o r1,r2 - rate-limiter instances o a - trivial aggregator instance (implemented using strict- priority-aggregator) o t - cyclic-timeslot-schedule-aggregator instance o p - strict-priority-aggregator instance Vassilev Expires July 8, 2020 [Page 39] Internet-Draft NETWORK-BRIDGE-03 January 2020 signaling video0 video1 best-effort v v v v | | | | +--+ +-----------+ / |r1| | t | / +--+ +-----------+ / | | / +-+ | / |a| | / +-+ | / | / / +--+ / / |r2| / / +--+ / / | / / +---------------+ | p | +---------------+ | v A.3. Topology The example flow configuration is for the topology in the diagram below. +-------+ p0 +-------+ p1 +-------+ | host0 |------| br0 |-----| host1 | +-------+ +-------+ +-------+ p2| +-------+ | host2 | +-------+ A.4. CLI listing CLI commands configuring flows and assigning flows to traffic- classes: Vassilev Expires July 8, 2020 [Page 40] Internet-Draft NETWORK-BRIDGE-03 January 2020 > create /flows/flow[id='video0'] -- \ match/vlan-match/vlan-id/vlan-id=10 \ actions/action[order='0']/output-action/out-port=p2 > merge /flows/flow[id='video0'] -- traffic-class=video0 > create /flows/flow[id='video1'] -- \ match/vlan-match/vlan-id/vlan-id=11 \ actions/action[order='0']/output-action/out-port=p2 > merge /flows/flow[id='video1'] -- traffic-class=video1 > create /flows/flow[id='best-effort-to-host0'] -- \ match/ethernet-match/ethernet-destination\ /address=00:01:02:03:00:00 \ actions/action[order='0']/output-action/out-port=p0 > merge /flows/flow[id='best-effort-to-host0'] -- \ traffic-class=best-effort > create /flows/flow[id='best-effort-to-host1'] -- \ match/ethernet-match/ethernet-destination\ /address=00:01:02:03:00:01 \ actions/action[order='0']/output-action/out-port=p1 > merge /flows/flow[id='best-effort-to-host1'] -- \ traffic-class=best-effort > create /flows/flow[id='best-effort-to-host2'] -- \ match/ethernet-match/ethernet-destination\ /address=00:01:02:03:00:02 \ actions/action[order='0']/output-action/out-port=p2 > merge /flows/flow[id='best-effort-to-host2'] -- \ traffic-class=best-effort > create /flows/flow[id='ptp-to-host0'] -- \ match/ethernet-match/ethernet-destination\ /address=00:01:02:03:00:00 \ actions/action[order='0']/output-action/out-port=p0 > merge /flows/flow[id='ptp-to-host0'] -- \ traffic-class=signaling > create /flows/flow[id='ptp-to-host1'] -- \ match/ethernet-match/ethernet-destination\ /address=00:01:02:03:00:01 \ actions/action[order='0']/output-action/out-port=p1 > merge /flows/flow[id='ptp-to-host1'] -- \ traffic-class=signaling > create /flows/flow[id='ptp-to-host2'] -- \ match/ethernet-match/ethernet-destination\ /address=00:01:02:03:00:02 \ actions/action[order='0']/output-action/out-port=p2 > merge /flows/flow[id='ptp-to-host2'] -- \ traffic-class=signaling > commit CLI commands configuring and monitorig the scheduler: Vassilev Expires July 8, 2020 [Page 41] Internet-Draft NETWORK-BRIDGE-03 January 2020 > replace /bridge/scheduler-classes/scheduler-class/gate-controllers\ /gate-controller[id='p']/inputs/input/queue-len value=1048576 > replace /bridge/scheduler-classes/scheduler-class/gate-controllers\ /gate-controller[id='t']/time-slot0-interval value=5000000 > commit > xget /interfaces/interface[name='if2']/scheduler/gate-controllers\ /gate-controller[id='r1']/inputs/input[index='1']/overflow-discards ... overflow-discards 33 ... > xget /interfaces/interface[name='if2']/scheduler/gate-controllers\ /gate-controller[id='p']/input-classes/ input-class[class='pri2']/overflow-discards ... overflow-discards 1000000 ... A.5. Configuration Data Instance p0 0 example:default-port 0 p1 1 example:default-port 1 p2 2 Vassilev Expires July 8, 2020 [Page 42] Internet-Draft NETWORK-BRIDGE-03 January 2020 example:default-port 2 example:best-effort example:best-effort example:best-effort example:signaling example:video0 example:video1 example:default-port example:default-port Vassilev Expires July 8, 2020 [Page 43] Internet-Draft NETWORK-BRIDGE-03 January 2020 example:best-effort example:default-port p example:pri2 0 example:signaling example:default-port r1 example:in 0 example:video0 example:default-port t example:timeslot0 0 example:video1 example:default-port t Vassilev Expires July 8, 2020 [Page 44] Internet-Draft NETWORK-BRIDGE-03 January 2020 example:timeslot1 0 a example:strict-priority-aggregator example:pri0 3 2048 r2 example:in 0 p example:strict-priority-aggregator example:pri0 1 2048 example:pri1 1 32768 example:pri2 3 1048576 r1 example:rate-limiter example:in 3 a example:pri0 0 10000000 12500 r2 example:rate-limiter example:in 1 p Vassilev Expires July 8, 2020 [Page 46] Internet-Draft NETWORK-BRIDGE-03 January 2020 example:pri0 0 10000000 125000 t example:cyclic-timeslot-schedule-aggregator example:timeslot0 3 1048576 example:timeslot1 3 1048576 p example:pri0 2 10000000 5000000 5000000 Vassilev Expires July 8, 2020 [Page 47] Internet-Draft NETWORK-BRIDGE-03 January 2020 best-effort-to-host0
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 0 p2 example:signaling video0 10 Vassilev Expires July 8, 2020 [Page 50] Internet-Draft NETWORK-BRIDGE-03 January 2020 0 p2 example:video0 video1 11 0 p2 example:video1 if0 ianaift:ethernetCsmacd p0 if1 ianaift:ethernetCsmacd Vassilev Expires July 8, 2020 [Page 51] Internet-Draft NETWORK-BRIDGE-03 January 2020 p1 if2 ianaift:ethernetCsmacd p2 A.6. Companion YANG Data Model for Implementations Not Compliant with NMDA The YANG modules defined in this document are designed to be used in conjunction with implementations that support the Network Management Datastore Architecture (NMDA) as defined in [RFC8342]. In order to allow implementations to use the data model even in cases when NMDA is not supported, the following companion module is defined. file "ietf-network-bridge-scheduler- state@2020-01-05.yang" module ietf-network-bridge-scheduler-state { namespace "urn:ietf:params:xml:ns:yang:ietf-network-bridge-scheduler-state"; prefix sched-state; import ietf-interfaces { prefix if; } import ietf-network-bridge-scheduler { prefix sched; } organization "IETF NETMOD (NETCONF Data Modeling Language) Working Group"; contact "WG Web: WG List: Editor: Vladimir Vassilev Vassilev Expires July 8, 2020 [Page 52] Internet-Draft NETWORK-BRIDGE-03 January 2020 "; description "This module contains /if:interfaces-state/if:interface augmentation which mirrors the 'scheduler' container as the one part of the 'ietf-network-bridge-scheduler' but contains only read-only state data. The data model is not needed when the underlying implementation infrastructure supports the Network Management Datastore Architecture (NMDA). Copyright (c) 2020 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; revision 2020-01-05 { description "Initial revision."; reference "RFC XXXX: Network Bridge"; } augment "/if:interfaces-state/if:interface" { description "Augments the interface model with scheduler specific data."; container scheduler { description "Each egress capable interface has scheduler. The scheduler is a tree of interconnected gate controllers."; container gate-controllers { description "Contains the list of gate controllers."; list gate-controller { key "id type"; description "The gate controller model can be augmented by external modules defining custom gate controller types."; leaf id { type string; description Vassilev Expires July 8, 2020 [Page 53] Internet-Draft NETWORK-BRIDGE-03 January 2020 "Gate controller identifier."; } leaf type { type identityref { base sched:gate-controller; } mandatory true; description "Gate controller type."; } container inputs { description "Contains the list of inputs."; list input { key "class index"; description "Double key list. There can be multiple instances of each input class."; leaf class { type identityref { base sched:gate-controller-input; } description "Input class."; } leaf index { type uint32; description "Index of the input instance of the corresponding input class."; } uses sched:gate-controller-queue-state; } } container input-classes { description "Contains the list of input-classes."; list input-class { key "class"; description "Contains the list of input-classes."; leaf class { type identityref { base sched:gate-controller-input; } description "Input class."; } Vassilev Expires July 8, 2020 [Page 54] Internet-Draft NETWORK-BRIDGE-03 January 2020 uses sched:gate-controller-queue-state; } } } } } } } Author's Address Vladimir Vassilev Lightside Instruments AS Email: vladimir@lightside-instruments.com Vassilev Expires July 8, 2020 [Page 55]